Moved git-hash determination to passed in build variable (#273)

build-docker.sh

@@ -52,6 +52,9 @@ if [ -z "${IMG_NAME}" ]; then
 exit 1
 fi
 
+# Ensure the Git Hash is recorded before entering the docker container
+GIT_HASH=${GIT_HASH:-"$(git rev-parse HEAD)"}
+
 CONTAINER_EXISTS=$(${DOCKER} ps -a --filter name="${CONTAINER_NAME}" -q)
 CONTAINER_RUNNING=$(${DOCKER} ps --filter name="${CONTAINER_NAME}" -q)
 if [ "${CONTAINER_RUNNING}" != "" ]; then
@@ -73,6 +76,7 @@ if [ "${CONTAINER_EXISTS}" != "" ]; then
 	trap 'echo "got CTRL+C... please wait 5s" && ${DOCKER} stop -t 5 ${CONTAINER_NAME}_cont' SIGINT SIGTERM
 	time ${DOCKER} run --rm --privileged \
 		--volume "${CONFIG_FILE}":/config:ro \
+		-e "GIT_HASH=${GIT_HASH}" \
 		--volumes-from="${CONTAINER_NAME}" --name "${CONTAINER_NAME}_cont" \
 		pi-gen \
 		bash -e -o pipefail -c "dpkg-reconfigure qemu-user-static &&
@@ -83,6 +87,7 @@ else
 	trap 'echo "got CTRL+C... please wait 5s" && ${DOCKER} stop -t 5 ${CONTAINER_NAME}' SIGINT SIGTERM
 	time ${DOCKER} run --name "${CONTAINER_NAME}" --privileged \
 		--volume "${CONFIG_FILE}":/config:ro \
+		-e "GIT_HASH=${GIT_HASH}" \
 		pi-gen \
 		bash -e -o pipefail -c "dpkg-reconfigure qemu-user-static &&
 	cd /pi-gen; ./build.sh ${BUILD_OPTS} &&